第十四周课程总结&实验报告（简单记事本的实现）

第十四周课程总结&实验报告（简单记事本的实现）

一、记事本

1.实验代码

package test;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.io.*;
class TextPad implements ActionListener{
    public static void main(String[] args) {
        new TextPad();
    }

    public TextPad(){
        JFrame frame = new JFrame("记事本");
        JMenuBar bar = new JMenuBar();
        JMenu fileMenu = new JMenu("文件");
        JMenu editMenu = new JMenu("编辑");

        ImageIcon newIcon = new ImageIcon("d" + File.separator + "Java" + File.separator + "作业" + File.separator + "新建.jpg");
        ImageIcon openIcon = new ImageIcon("d" + File.separator + "Java" + File.separator + "作业" + File.separator + "打开.jpg");
        ImageIcon saveIcon = new ImageIcon("d" + File.separator + "Java" + File.separator + "作业" + File.separator + "另存为.jpg");
        ImageIcon closeIcon = new ImageIcon("d" + File.separator + "Java" + File.separator + "作业" + File.separator + "关闭.jpg");
        JMenuItem newItem = new JMenuItem("新建(N)", newIcon);
        JMenuItem openItem = new JMenuItem("打开(O)", openIcon);
        JMenuItem saveItem = new JMenuItem("另存为(A)", saveIcon);
        JMenuItem closeItem = new JMenuItem("关闭(X)", closeIcon);

        newItem.setMnemonic(KeyEvent.VK_N);
        openItem.setMnemonic(KeyEvent.VK_O);
        saveItem.setMnemonic(KeyEvent.VK_A);
        closeItem.setMnemonic(KeyEvent.VK_X);
        fileMenu.add(newItem);
        fileMenu.add(openItem);
        fileMenu.add(saveItem);
        fileMenu.add(closeItem);
        newItem.setAccelerator(KeyStroke.getKeyStroke((char) KeyEvent.CTRL_MASK));
        newItem.addActionListener((ActionListener) this);
        openItem.addActionListener((ActionListener) this);
        saveItem.addActionListener((ActionListener) this);
        closeItem.addActionListener((ActionListener) this);
        bar.add(fileMenu);
        bar.add(editMenu);
        frame.add(bar);
       frame.setJMenuBar(bar);

        frame.setSize(400,300);
        frame.setVisible(true);

    }
   public void actionPerformed(ActionEvent event){

        Object obj = event.getSource();
    if (obj instanceof JMenuItem){
        JMenuItem item = (JMenuItem) obj;
        JMenuItem newItem = new JMenuItem();
        JMenuItem openItem = new JMenuItem();
        JMenuItem saveItem = new JMenuItem();
        JMenuItem closeItem = new JMenuItem();
        if (item.equals(newItem)){
            new TextPad();
        }else if (item == openItem){
            JFileChooser chooser = new JFileChooser();
            chooser.showOpenDialog(null);
            Object file = chooser.getSelectedFile();
            try {
                FileInputStream fis = new FileInputStream((File) file);
                byte[] b = new byte[fis.available()];
                fis.read(b);
                PrintWriter area = null;
                area.append(new String(b));
                fis.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }else if (item == saveItem){
            JFileChooser chooser = new JFileChooser();
            chooser.showSaveDialog(null);
            File file = chooser.getSelectedFile();
            try{
                if (!file.exists()){
                    file.createNewFile();
                }
                FileInputStream fos = new FileInputStream(file);
                AbstractButton area = null;
                assert false;
                byte[] b =area.getText().getBytes();

                fos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }else if (item == closeItem){
            System.exit(1);
        }
    }
    }
}

2.实验结果截图

改进后的记事本

1.实验代码

package cn;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.io.*;

public class TextPad implements ActionListener {
    public static void main(String[] args) {
        new TextPad();
    }

    JMenuItem newItem;
    JMenuItem openItem;
    JMenuItem saveItem;
    JMenuItem closeItem;
    JTextArea textArea;


    public TextPad() {
        JFrame frame = new JFrame("记事本");
        JMenuBar bar = new JMenuBar();
        JMenu fileMenu = new JMenu("文件");
        JMenu editMenu = new JMenu("编辑");


        ImageIcon newIcon = new ImageIcon("D:\Java\1.基础班\untitled2\src\cn\iamges\新建.png");
        ImageIcon openIcon = new ImageIcon("D:\Java\1.基础班\untitled2\src\cn\iamges\打开.png");
        ImageIcon saveIcon = new ImageIcon("D:\Java\1.基础班\untitled2\src\cn\iamges\另存为.png");
        ImageIcon closeIcon = new ImageIcon("D:\Java\1.基础班\untitled2\src\cn\iamges\关闭.png");

        newItem = new JMenuItem("新建(N)", newIcon);
        openItem = new JMenuItem("打开(O)", openIcon);
        saveItem = new JMenuItem("另存为(S)", saveIcon);
        closeItem = new JMenuItem("关闭(X)", closeIcon);

        //文件菜单里的快捷键
        newItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, ActionEvent.CTRL_MASK));
        openItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, ActionEvent.CTRL_MASK));
        saveItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, ActionEvent.CTRL_MASK));
        closeItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, ActionEvent.CTRL_MASK));


        newItem.addActionListener(this);
        openItem.addActionListener(this);
        saveItem.addActionListener(this);
        closeItem.addActionListener(this);


        //文件
        fileMenu.add(newItem);
        fileMenu.add(openItem);
        fileMenu.add(saveItem);
        fileMenu.add(closeItem);


        //添加文本域与滚动条
        textArea = new JTextArea();
        frame.getContentPane().add(new JScrollPane(textArea, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS));

        textArea.setEditable(true);


        //添加菜单选项到菜单栏
        bar.add(fileMenu);
        bar.add(editMenu);


        //添加菜单栏
        frame.setJMenuBar(bar);

        frame.setSize(800, 500);
        frame.setLocation(500, 240);
        frame.setVisible(true);

    }


    @Override
    public void actionPerformed(ActionEvent event) {
        Object obj = event.getSource();

        if (obj instanceof JMenuItem) {

            JMenuItem item = (JMenuItem) obj;


            if (item.equals(newItem)) {
                new TextPad();
            } else if (item == openItem) {
                JFileChooser chooser = new JFileChooser();
                chooser.showOpenDialog(null);
                Object file = chooser.getSelectedFile();
                try {

                    FileInputStream fis = new FileInputStream((File) file);
                    byte[] b = new byte[fis.available()];
                    fis.read(b);
                    textArea.append(new String(b));


                    fis.close();
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } else if (item == saveItem) {    //另存为
                JFileChooser chooser = new JFileChooser();
                chooser.showSaveDialog(null);
                File file = chooser.getSelectedFile();
                try {
                    if (!file.exists()) {
                        file.createNewFile();
                    }
                    FileOutputStream fos = new FileOutputStream(file);
                    byte[] b = textArea.getText().getBytes();
                    fos.write(b);
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } else if (item == closeItem) {
                System.exit(1);
            }
        }
    }
}

2.实验结果截图

3.改进后：
代码的错误减少了
（1）添加上了小图标
（2）可以打开和建立窗口了
（3）可以另存为
（4）实现了close关闭